Improvement in machines for molding knobs



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O. H. PALMER. MACHINE FOR MOLDING KNOBS.

Patented Jan. 31, 1871.

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G. H. PALMER. MACHINE FOR MOLDING KNOBS.

Patented Jan. 31, 1871.

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No. 111,470. 1 Patented Jan. 31, 1871.

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' which my'machineisadapted forn olding.

. Letters Patent m m, dated January- 31,1871.

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' Be it known thug I, CHARLES H. Rummy-of Brooklyn, E. D., in hecounty of Kings and State of New York, have invented chew and useful Machine 4 for Moldiug Knobs; and'I do hereby declare that the following is a full, clear, and exact description thereof,-reference being had to the accompanying drawing making part of this specification, in whichi .j

- Figure 1, plate 1,is a front elevation of my improved molding-machine, partly in section, showing a knob "ready tofbe removed.

Figure 2,'plate 2, isan elevation of'the machine, partly in section, showing a knob relieved .from its mold-sections andmised to a. position for removal.

' ,"Figure 3,.plate3, is a section taken transverselyand vertically through parts ofthe machine, on one .side of the center tbereotifshoiving pcrticnlarly the Figure4, plate 3, is a view of one follh of 'knob Similar letters .of reference indicate corresponding parts in the several figures;

This invention relatesto machinery whichis adapted for molding drawer, shutter, and sash-knobsof porce-' lam, clay, or other suitable molding material.. The

diflicnlty to be overcome in the production of these kindsofknobs consists-in the formation of the con- 'tractedpecks which aregbetwcen the heads and bases. This has been done before my invention by means of two semicircular mold-sections, .which were dropped into a mold, and which were removed with thc=knobs from the mold and then detached by hand from the knobs. v i

' o l I' k The nature of my invent on and improvement consists- -.1 irs t, in two vertically-divided laterally-movable :mold-sections, which are applied between suitable guides, and which have constructed on their inner surt'hose parts of the mold which produce the contracted necks of the knobs, in combination with a. pressingrplnhger for condensing the clay in the mold, as will be hereinafter -explained.-

the finished knolxs from the mold, with laterally-movable mold-sections and a pressing-plunger, as will be hereinafter explained.

1 Third, in the combination of-a bracing-strap and a locking-device with the said: laterally-movable mold sections, whereby these sections are prevented from separating during the act of pressing the clay in them,

as willbehereinaftcr explained.

Fourth, in the combination of a-treadlc, which is held up by a spring, with a system of levers-which are connected to the. laterally-movable molds for separat-" Second, in the combination of a device for elevating ing and biingingthem together, and also'w'ith a device which will lift the knobs after the mold-sections. have;

been separated, as will be hereiniifter explained 1'0 enable others skilled in ti my invention, 1 will describe its construction and opcration.

In'the accompanying drawing-- I .A. represents a suitable deviceor table, upon which is secured an upright press-frame, B, in which works up and down a pressing follower or plunger, 0, which is prevented from turning by' a feather and groove, and which is moved up and down by a screw; D.

'lh'e lower'cnd mof the plunger '0 is concave, and forms that part of the mold which produces the convex surfaces on the heads of the knobs.

Upon the sill b of the frame B are supported two uprig-ht'inold-se'ctions a a, which constitute-the body of the mold, and which are allowed. to slide toward. and from'cach other, but are guided and held down in place by a dovetail-grooveJy, into which the bases of the sections aaare fitted. When these sections aware brought together and looked, as will be hereinafter explained,

they present an annularconvex portion, 3, whichproduccs the annular concavity or contracted-necks of the knobs (has shown in fig. 1.=

The portions 8 onthc two sections a a may be so applicdwithin these sections thiit they are readily remov- I able when it is desired to substitute in their stead othor forms and sizes of neck-forming positions.- By hav 'ing these portions 3, removable diti'erentforms and sizes of knobs can he'produccd in the machine.

- The mold-sections a a have reds E E pivoted them, which rods extend outward and are pivoted to the shortest arms of bent levers F'F.

' Theselevers have their fuIcrums-at'f f, and their loiigestarms are connected to camp, on a; vertical rod, 'n, by means of rods P P.

'lhclower forked end of the rod at is pivoted to a trundle, G, which is supported by standards G, and

.which is conncetedou one side of its fulcrum to the table-top. A by means of a'helical spring, S, shown in figs. 1 and v The uppcr'forked end n of the vcrtical'rod u receives between its forks a .pin, 1), which is applied to the forked end c of an elevating-rod, c.

This rod 0 passes up through the tabletop A and through the sill b of. i'rame'A, cud has a cylindrical enlargement, e, formed onit, which forms the bottom of the mold when in the position'shown in fig. 1.

The vertical axis of the-rod c,--and its enlargement ,e, coincide with the vertical axis of the plunger 0, and

also with the center of the mold-sections a icwhen the letter are brought-together.

e art to understand On the upper end of the enlargement-c, and in thejcenter thereofl'rises a pin, c .,which produces the sockets into the bases of the knobs, as shown in figs. 1 and 2. This pin 'i may be made long enough to produce holes entirely through the knobs.

A. strap, 0, is secured fast to one of the mold-sec-.

are beveled and pivoted to a vertically-vibrating handlever, s, on opposite sides of and equidistant from its fulcrum, so that, when the two sections a. a. are allowed to go together, a singlemovemeut of the hand lever s will force the two bolts through the ends of the strap 0, and thus 'forciblydraw together said moldsections and thus hold them firmly. The strap ('2 and 'its bolts thus form a band which will prevent'the mold-sections from yielding laterally while the clay is being pressed iutothem.

' Dpemtion.

When the mold-sections a a are brought together and looked, as above described, the clay is put into the mold in sufiicient quantities to form'a knob. The screw D is then turned by its T-handle, and the plunger thus forcibly driven into the mold. The workman then unlocks the sections a a, raises the plunger G, and, with his foot upon the treadle G, be depresses the treadle and separates the said sections, thus leaving the knob upon the upper end of the vertically-movable enlargement e. By continuing to depress-thetreadle the end of the rod n will come in contact with the pin 1) and raise the rod s with the knob to the position shown in fig. 2, when it can be readily removed.

Alter removing the knob the workman releases the treadle and allows spring S to return the parts tothe,

position shown in fig. 1, when the sections a a. are again locked and the process repeated, as above described.

It will be seen from the above description that the work of. adjusting the mold-sections, introducing the clay,- pressing the clay' and removing the knobs, can be performed very rapidly and by persons who are not experienced workmen. Also, that there are no parts about the mold-sections which'are liable to rapid wear,

and which, for this reason, would produce imperfect;

work.

Having described my invent-ion,-

-What I claim as new, and desire to secure by Lab ters Patent,.is-

1. The vertically divided and. laterallymovable mold-sectious'wa, having applied to. them the neckforming portions 3 s, in combination with a pressingplunger, 0, substantially as described. 2. The elevating device. 0, in combinationwith the laterally-movable sections a a, constructed as described,

and the pressing-plunger G, substantially as described;

nected by levers and rods to the laterally-movable mold-sections a a, in combination with the forked rod n, pin 1), and elevating-rod c, said parts being so constructed that the mold-sections a a. will be separated before the rod 0, with its knob cl, begin'to rise. j

OHARLES'H. PALMER. Witnesses:

Eon. F. Bnown,

J. V. CAMPBELL. 

